>>33884593
https://www.science20.com/news_releases/brains_hate_circuit_identified
Well, hate and love share some of the same brain areas, particularly in the putamen and insula, which are involved in emotional intensity and arousal. While both are high-arousal emotions, love is associated with a deactivation of areas for judgment and reasoning, whereas hate involves less deactivation of the cerebral cortex, allowing for critical thinking and planning for revenge.